Domain Name Com's Electronics Texas Instruments TI-89 Titanium Graphing Calculator

Electronics Texas Instruments TI-89 Titanium Graphing Calculator

Domain Name Com's - Electronics : Texas Instruments TI-89 Titanium Graphing Calculator

- good if you need it
its a great product if you really need it, a ti 84 is good for the majority of college students. Save yourself the extra 40 dollars and get a ti84 if you don't plan on doing a math heavy major.

Rating:

- Great calculator
I buy this calculator 1 month ago, and I is the best calculator I ever had. It arrive really quickly and I love the easy way to use fractions, find solutions to equations, the interactive screen, the lots of aplications and the price! That is the best I can find looking in a lot places.
You must have it!

Rating:

- Does everything, but has drawbacks
First of all, this calculator does everything I would want it to. 3d graphing, equation solving, integrals, precise answers, pretty print, these features are all wonderful and well documented. However, I would like to present some of the disappointments I encountered when using this calculator.

Speed (pt 1): When graphing my first equations, I immediately noticed that the 89t was slower than the 83+. I happen to have both (and a stopwatch as well) so I performed a few tests and found that on average the 89t graphs about 40% slower than the 83+. At first I was shocked, but I reminded myself that the screen has a slightly higher resolution and the 89t probably does more precise calculations when graphing. But I am still shocked, 40% reduction in graphing time can really add up when your plots are complicated.

Speed (pt 2): The 89t has a fancy "apps desktop" that comes up when you first turn the calculator on. I recommend disabling this launcher because it introduces a 0.5 second boot time and then requires you to press "HOME" before you can start typing in equations to calculate. For me, this adds up to about a two second gap between pressing the power button and pressing the first digit of the calculation I want to perform. Now, the catch with disabling the "apps desktop" is that if its "off" its off completely, you can't bring it up when you want it. If its "on" its on every time you turn on the calculator. I'd really like a start-up screen option somewhere so that I can keep the "apps desktop" but not start-up to it every time.

Speed (pt 3): The Speed in other areas seems good compared to the 83+.

Interface: Several reviewers have commented about the interface. There are a few problems here. The biggest one is the 'hidden' functions of buttons. Pressing the diamond and then the "EE" button will bring up a 'key' showing you where these 'hidden' functions are. The most annoying hidden function is 'log' which is associated with the '7' key, the rest are not as commonly used-so just remember diamond-7=log. The key I miss the most compared to my 83 is the x^2 key (this key was a one-button way to square a number), on the 89t you have an extra keystroke for the common task of squaring a number.

Screen: I have fantasies about a TI calculator with a large colorful touchscreen (honestly, TI, these things haven't changed much since the 90s, where is the innovation?). This screen has a higher resolution than the 83, but the screen is about the same physical size, so you really don't notice the extra resolution unless you are playing games. The 89 also sucks up 10% of the screen space with the function menu that is always across the top of the screen. So when looking at plots, you actually get a smaller view than you would on an 83. It would be nice if you could toggle the presence of the function menu.

Conclusion: Of course this calculator can do just about everything you'll ever need it to. And what the built in programming can't handle, you can probably download a custom program to do--there are tons of programs on the web for these calculators. Unfortunately, this calculator is a little slower to graph things, takes a little longer to input things, and has a pretty cramped little screen. Even if it costs four times as much, I would definitely buy a TI calculator with a large colorful screen-so I hope TI is listening!

Rating:

- Very good, but not for basic classes.
I was forced to buy this calculator for an Introduction to Calculus class, and I'm generally very pleased. It does everything I wished my TI-84 did, and more. For example, it will integrate, differentiate, zero functions, and display fractions and radicals automatically. The clock is nice too.

Strangely, it takes a significant longer time to graph. Timing it, my TI-84 will graph y=x in around 1 second. The TI-89 takes around 4, and takes even longer to graph more complicated functions.

I also takes a lot of button pushing to accomplish basic tasks. To find the sin(.75) it takes me 9 buttons versus 6 on my old calculator. Doesn't seem like a lot, but since I'm only doing basic tasks the calculator wastes more of my time than it saves.

Overall, it's a really nice calculator, but don't buy it if your not going to utilize it correctly.

Rating:

- dav e's comments
TI puts out really quality instruments. I have bought 83's, 84's, 86's, Inspire, and 89's........ all but the Inspire met my expections. It's nothing but a crossover TI 84 and something useless.....Each of the instrments have a similiar but steep learning curve.....quite frequently I discover some new function or a different way to work an old function.

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